Are you still on Prozac , then this is what I said all along, switching ssri,s overnight you get no withdrawal , but only if you want to switch meds. This does not work if you intend to stop the second ssri. Its only to save withdrawal and start up some docs put you through for no reason. If you are on good terms with your doc do has he tells you, but just ask if it can be done, some are still old school, and put you throught weeks of withdrawal and start up through ignorance .